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Objective <p>To translate, cross-culturally adapt, and examine the psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS-V) in individuals with knee osteoarthritis (KOA).</p> Design <p>A cross-sectional study.</p> Setting <p>Two hospitals and two Catholic convents in Vietnam.</p> Participants <p>174 Vietnamese individuals aged ≥ 45 years with KOA were diagnosed based on clinical examination using the National Institute for Health and Care Excellence (NICE) criteria.</p> Main outcome measures <p>Participants completed the baseline assessment and 5-7days retest, which included the LEFS-V, Numerical Pain Rating Scale (NPRS), and Knee Injury and Osteoarthritis Outcome Score (KOOS). Psychometric property testing included content validity (CVI), internal consistency (Cronbach’s α), test–retest reliability (ICC <sub>(3,1)</sub>, standard error of measurement (SEM), minimum detectable change (MDC95), and construct validity. Spearman correlations were used to examine associations with the KOOS subscales and NPRS.</p> Results <p>Strong content validity with item-CVI from 0.83 to 1.00. LEFS-V demonstrated high internal consistency (Cronbach’s α = 0.942) and excellent test–retest reliability (ICC <sub>(3,1)</sub> = 0.985; 95% CI: 0.974–0.991), SEM = 1.4 and MDC<sub>95</sub> = 3.88. LEFS-V correlated positively with KOOS-Pain (r<sub>s</sub> = 0.59), KOOS-Symptoms (r<sub>s</sub> = 0.30), KOOS-ADL (r<sub>s</sub> = 0.71), KOOS-Sport/Rec (r<sub>s</sub> = 0.50), and KOOS-QoL (r<sub>s</sub> = 0.18), and negatively with NPRS (r<sub>s</sub> = -0.63).</p> Conclusion <p>The LEFS-V is a reliable and valid scale for assessing lower extremity functional status in Vietnamese individuals with KOA.</p>

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Cross-cultural adaptation and psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS) in individuals with knee osteoarthritis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月19日

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  • Van Phat Huynh,
  • Thi Diep Tran,
  • Komsak Sinsurin,
  • Chutima Jalayondeja

摘要

Objective

To translate, cross-culturally adapt, and examine the psychometric properties of the Vietnamese version of the Lower Extremity Functional Scale (LEFS-V) in individuals with knee osteoarthritis (KOA).

Design

A cross-sectional study.

Setting

Two hospitals and two Catholic convents in Vietnam.

Participants

174 Vietnamese individuals aged ≥ 45 years with KOA were diagnosed based on clinical examination using the National Institute for Health and Care Excellence (NICE) criteria.

Main outcome measures

Participants completed the baseline assessment and 5-7days retest, which included the LEFS-V, Numerical Pain Rating Scale (NPRS), and Knee Injury and Osteoarthritis Outcome Score (KOOS). Psychometric property testing included content validity (CVI), internal consistency (Cronbach’s α), test–retest reliability (ICC (3,1), standard error of measurement (SEM), minimum detectable change (MDC95), and construct validity. Spearman correlations were used to examine associations with the KOOS subscales and NPRS.

Results

Strong content validity with item-CVI from 0.83 to 1.00. LEFS-V demonstrated high internal consistency (Cronbach’s α = 0.942) and excellent test–retest reliability (ICC (3,1) = 0.985; 95% CI: 0.974–0.991), SEM = 1.4 and MDC95 = 3.88. LEFS-V correlated positively with KOOS-Pain (rs = 0.59), KOOS-Symptoms (rs = 0.30), KOOS-ADL (rs = 0.71), KOOS-Sport/Rec (rs = 0.50), and KOOS-QoL (rs = 0.18), and negatively with NPRS (rs = -0.63).

Conclusion

The LEFS-V is a reliable and valid scale for assessing lower extremity functional status in Vietnamese individuals with KOA.